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CN‐Modified Imidazopyridine as a New Electron Accepting Unit of Thermally Activated Delayed Fluorescent Emitters
Author(s) -
Kothavale Shantaram,
Lee Kyung Hyung,
Lee Jun Yeob
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903877
Subject(s) - imidazopyridine , phenoxazine , fluorescence , common emitter , photochemistry , quantum yield , acceptor , chemistry , oled , acridine , photoluminescence , phosphorescence , electron acceptor , quantum efficiency , materials science , optoelectronics , combinatorial chemistry , organic chemistry , optics , medicine , physics , layer (electronics) , pharmacology , phenothiazine , condensed matter physics
Two efficient thermally activated delayed fluorescent (TADF) emitters were developed by utilizing CN‐modified imidazopyridine as an acceptor unit. The CN‐modified imidazopyridine acceptor was combined with either an acridine donor or a phenoxazine donor through a phenyl linker to produce two TADF emitters, Ac‐CNImPy and PXZ‐CNImPy. The acridine‐based Ac‐CNImPy emitter exhibited sky‐blue emission with a CIE coordinate of (0.18, 0.38), whereas the phenoxazine‐donor‐based PXZ‐CNImPy showed greenish‐yellow emission with a CIE coordinate of (0.32, 0.58). A high photoluminescence quantum yield of 80 % was observed for the PXZ‐CNImPy emitter compared with 40 % for the Ac‐CNImPy emitter. Organic light‐emitting diodes based on the PXZ‐CNImPy emitter demonstrated high external quantum efficiency of 17.0 %. Hence, the CN‐modified imidazopyridine unit can be considered as a useful electron acceptor for the future design of highly efficient TADF emitters.